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#include <bits/stdc++.h>
#define nm 101
using namespace std;
ifstream fin("tije.in");
ofstream fout("tije.out");
int n;
int main()
{
int i,j,k;
fin>>n;
fin.close();
for(i=n-1;i>0;i--)
{
for(j=n;j>0;j--)
{
for(k=1;k<=i;k++)
fout<<j<<' '<<j+1<<'\n';
for(k=1;k<=i;k++)
fout<<n+1<<' '<<1<<'\n';
}
}
fout.close();
return 0;
}